| Issue |
EAS Publications Series
Volume 61, 2013
Gamma-ray Bursts: 15 Years of GRB Afterglows – Progenitors, Environments and Host Galaxies from the Nearby to the Early Universe
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|---|---|---|
| Page(s) | 91 - 93 | |
| Section | Chapter II: Prompt Emission-I Observations | |
| DOI | https://doi.org/10.1051/eas/1361014 | |
| Published online | 22 July 2013 | |
A.J. Castro-Tirado, J.Gorosabel and I.H. Park (eds)
EAS Publications Series, 61 (2013) 91-93
The Multi-Band Emission Profile in GRB
1 Key Laboratory for the Structure and
Evolution of Celestial Objects, Chinese Academy of Sciences,
Kunming
650011,
China
2 National Astronomical
Observatories/Yunnan Observatory, Chinese Academy of Sciences,
PO Box 110,
Kunming
650011,
China
Gamma-ray burst (GRB) light curves generally are energy dependent, i.e., the higher the photon energy, the narrower the pulse. In addition, the peak of the pulse at lower energies is usually delayed compared with that in higher energy. The phenomenon even exists in some X-ray flares and following optical flares. However, its origin is still unclear. Here we calculate the emission in different bands produced from different-thickness shocked shell due to radiative cooling, with the equal arrival time volume effect considered. We find the emission profile is energy dependent and that the light curves show spectral lag, which are consistent with the observations. This can be an explanation of the energy dependence of light curve and spectral lag in GRB, X-ray flare and following optical flare.
© EAS, EDP Sciences 2013